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x86/oprofile: add IBS support for AMD CPUs, IBS buffer handling routines

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This patchset supports the new profiling hardware available in the
latest AMD CPUs in the oProfile driver.

Signed-off-by: Barry Kasindorf <barry.kasindorf@amd.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: oprofile-list <oprofile-list@lists.sourceforge.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Barry Kasindorf
2008-07-22 21:08:54 +02:00
committed by Ingo Molnar
parent ee648bc77f
commit 345c25730d
3 changed files with 140 additions and 2 deletions
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68
drivers/oprofile/cpu_buffer.c
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@@ -5,6 +5,7 @@
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
* @author Barry Kasindorf <barry.kasindorf@amd.com>
*
* Each CPU has a local buffer that stores PC value/event
* pairs. We also log context switches when we notice them.
@@ -207,7 +208,7 @@ static int log_sample(struct oprofile_cpu_buffer * cpu_buf, unsigned long pc,
return 1;
}
static int oprofile_begin_trace(struct oprofile_cpu_buffer * cpu_buf)
static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
{
if (nr_available_slots(cpu_buf) < 4) {
cpu_buf->sample_lost_overflow++;
@@ -252,6 +253,71 @@ void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
oprofile_add_ext_sample(pc, regs, event, is_kernel);
}
#define MAX_IBS_SAMPLE_SIZE 14
static int log_ibs_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, int is_kernel, unsigned int *ibs, int ibs_code)
{
struct task_struct *task;
cpu_buf->sample_received++;
if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
cpu_buf->sample_lost_overflow++;
return 0;
}
is_kernel = !!is_kernel;
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
add_code(cpu_buf, is_kernel);
}
/* notice a task switch */
if (!is_kernel) {
task = current;
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
}
}
add_code(cpu_buf, ibs_code);
add_sample(cpu_buf, ibs[0], ibs[1]);
add_sample(cpu_buf, ibs[2], ibs[3]);
add_sample(cpu_buf, ibs[4], ibs[5]);
if (ibs_code == IBS_OP_BEGIN) {
add_sample(cpu_buf, ibs[6], ibs[7]);
add_sample(cpu_buf, ibs[8], ibs[9]);
add_sample(cpu_buf, ibs[10], ibs[11]);
}
return 1;
}
void oprofile_add_ibs_sample(struct pt_regs *const regs,
unsigned int * const ibs_sample, u8 code)
{
int is_kernel = !user_mode(regs);
unsigned long pc = profile_pc(regs);
struct oprofile_cpu_buffer *cpu_buf =
&per_cpu(cpu_buffer, smp_processor_id());
if (!backtrace_depth) {
log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code);
return;
}
/* if log_sample() fails we can't backtrace since we lost the source
* of this event */
if (log_ibs_sample(cpu_buf, pc, is_kernel, ibs_sample, code))
oprofile_ops.backtrace(regs, backtrace_depth);
}
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);